Electric heating device.



L. F. PARKHURST.

ELECTRIC HEATING DEVICE. APPLICATiON FILED JUNE 18, 1915.

1,22 1 2., Patented June 5, 1917.

Inventor:

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LEON F. PARKHURST, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC HEATING DEVICE.

Specification of Letters Patent.

Application filed June 18, 1915. Serial No. 34,927.

To all whom it may concern:

Be it known that I, LEON F. PARKHURs'r, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Electric Heating Devices, of which the following is a specification.

My invention relates to an electric cooking device, and more particularly to a device of this type in which radiant heat is desired for performing the cooking operation.

In a patent which was issued to me March 8th, 1910, No. 951,287, is disclosed an electric toaster in which helical coils of bare resistance wire are supported in a frame and areexposed on either side so that articles which are to be operated upon, and which are placed on either side of the device, receive direct radiation from the resistance unit.

In one of its aspects, my present invention is an improvement over that shown in my prior patent in that all parts of the resistance unit, which is by preference made of armored or sheathed wire, lie in a single plane, so that the articles operated upon are uniformly spaced from the source of radiant heat, and the general arrangement of the heating unit and the parts cooperating therewith lend to the compactness and general attractiveness of the device. Sheathed wire which is suitable for the purposes of my invention is disclosed in a patent which was issued to Chester N. Moore, August 11th, 1914, No. 1,107,233. Briefly, it may be said that such wire is composed of a resistance conductor surrounded by a metallic sheath with an intervening layer of compressed heat conducting but electric insulating powder, such, for example, as magnesia.

My invention also comprises a novel construction of the supporting frame of an electric heating device, which is simple, cheap, and compact, and the novel features of which will be apparent from the following description, and will be more particularly pointed out in the claims.

For a fuller understanding of my invention, reference may be had to the accompanying drawings, in which Figure 1 is a front elevation of a toaster embodying my invention; Fig. 2 is an end elevation thereof; Fig. 3 is an inverted plan view on the line w-w of Fig. 1; Fig.4 is a vertical section on the line yy of Fig. 1; and Fig.

to form a base support for thedevice, and

are flared outwardly at the top, as at 15, to form a support for the bread or other article which is to be or which has been operated upon. The loops 10 and 11 are secured together in spaced relation to each other by clips 12 and 13 located near the top and bottom of the loops, each of the clips being formed of two pieces 12 and 12 and 13 and 13, respectively, and engage the loops 10 and 11 on opposite sides. Transverse supporting members 16 and 17 for the heating unit, which are preferably made in channel form, are secured to the clips 13 and 12, respectively, and form with the loops a rigid framework for supporting the heating unit. A plurality of vertical metallic ,strips 18 are mounted in the supporting members 16 and 17 the strips being preferably provided with contracted ends 19 which pass through suitable slots in the transverse support 16 (see Fig. 5) and through similar slots in the support 17. The strips 18 are provided with slots 20 all of which include a common plane, the'slots of each strip registering with those of the other strips. The resistance unit 21 is folded back and forth upon itself in a zigzag-form, and arranged in two sections, the folds of the two sections of the resistance unit being received in the slots 20 of the metallic strips 18- at the left and at the right, respectively, of the device. The upper and lower arms of each fold lie in .the top and bottom of their respective slots, the sheathed wire which is by preference used being sufficiently stiff to maintain its proper position in the frame when it has been assembled therein. The sheathed wire is provided with terminals 22 which are connected to pin terminals 23 mounted in a suitable insulating member 24, which is, in turn,

mounted in one of the wings of the channel support 16. Guard members 25, which .are here shown as inverted U-shaped rods,

are carried by the supports 16 and 17, and inclose the heating unit. Holders 26, for the bread or other article to be treated, are mounted at either side of the heating unit on rods 27 which are, in turn, pivotally mounted in the members 10 and 11, respectively. These holders are provided with projecting fingers 28, by which the holders may be opened. The holders26 are forced inwardly against the article by springs 29.

It will be apparent to those skilled in the art that in a toaster or other heating device embodying my invention the heating unit is advantageously placed with reference to the bread or other article operated upon,

and that the device is simple, compact, and rugged in construction. 1

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is-- 1. In an electric heating device, a frame comprising a plurality of parallel metallic strips provided with registering slots all of which include a common plane, a continuous zigzag armored resistance wire having its folds received in said slots, and means for supporting an article to be treated on either side of the resistance unit.

2. An electric heating device comprising a frame formed of two upright continuous metallic loops secured together and flared outwardly at the bottom to form a base support for the device, and an electric heating unit mounted between said loops. 3. An electric heating device comprising a frame formed of two upright continuous metallic loops secured together in spaced relation, and flared outwardly at the bottom and at the top to form a base support for the device and for the article to be operated upon, respectively, and an electric heating unit mounted between said loops.

4. An electric heating device comprising a'frame formed of two upright substantially rectangular wire loops secured together in spaced relation, transverse members secured to said loops, substantially vertical members secured in said transverse members and an electric heating unit supported in said members.

5. In an electric heating device, a frame comprising a plurality of substantially parallel supporting strips provided with registering slots, and an armored resistance conductor threaded back and forth through the slots of adjacent strips and against the top and bottom walls of said slots.

6. An electric heating device comprising two upright wire loops spaced apart and flared outwardly at the bottom to form a base support for the device, transverse members secured to said loops near the top and bottom thereof, and formingwith said loops a rigid frame, and an electric heating unit secured in position between said transverse members.

7. An electric heating device comprising 'two upright wire loops spaced apart and flared outwardly at the bottom to form a base support for the device, transverse members secured to said loops near the top and bottom thereof and forming with said loops a rigid frame, substantially vertical members secured in said transverse members, and an electric heating unit supported by said vertical members.

'8. An electric heating device comprising two upright wire loops spaced apart and flared outwardly at the bottom to form a base support for the device, transverse members secured to said loops near the top and bottom thereof and forming with said loops a rigid frame, an electric heating unit secured in position between said transverse members, and terminals therefor mounted on the lower transverse member.

In witness whereof, I have hereunto set my hand this 16th day of June, 1915.

LEON F, PARKHURST. 

